Turning gear



Nov. 25, 1924- I 1,516,998

T. w. CURRY ET AL TURNING GEAR Filed June 26, 1923 v Inventors jfiamaail (zrr Attorney Patented Nov. 25, 1924.

UNITED STATES 1,516,998 rarsnr OFFICE.

THOMAS W. CUR-RY AND JOHN F. GODFREY, F EECEQU, NOVA SCOTIA, CANADA, AS-

SIGNOR-S OF ONE-FIFTH TO FR 1311 $1.13,?) N ONE-FIFTH TO DONALD F. MORRISON, AND ONE-FIFTH TO B. .T-ETERDNMHN CMFUZMOBL .laLL Q3 PICTOU, NOVA $COTIA, CAN- ADA.

TURNING To all whom it may concern Be it known that we, THOMAS W. Conny and Jorrn F. GonirnEY. both subjects of the King of Great Britain, residing at Pictou Province of Nova- Scotia, Canada, have invented certain new and useful Improvements in Turning Gears: and we do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention pertains to novel improvements in a turning gear for use in connection with engines. Although the device may he used in conjunction with engines of any character, it is designed primarily for turning over an engine on board ship by operating directly upon the power shaft.

lhe principal object of the invention is the provision of a device of this character adapted to work in either direction. To this end, the shaft carries a pair of oppositely cut ratchets with which are associated actuating hand levers and pawls adapted for selective engagement with the ratchets. In a modified construction there is provided a single power lever instead of the two hand levers, this power lever carrying the two pawls which engage the ratchet. The power lever further carries a lever mechanism bringing one or the other of the pawls into engagement with a ratchet. In an alternative form of the power lever construction. the pawl actuating device is operated by a lever which is not carried by the power lever and is consequently independent thereof. This construction results in safer operation, since the hands of the operator are not in the way of the moving power lever.

It will be apparent that a device constructed in accordance with. the invention can he used for moving the engine out of dead center. starting the engine, or moving it slightly when it is under repair.

he invention is fully disclosed in the following description and in the accompanying drawings in which:

Figure 1 is a side elevation of the device applied to a shaft;

Figure 2 is a front elevation;

Figure 3 is a section on the line'3-3 of Figure 2;

Figure dis a frontelevation of a modifica tion;

GEAR.

Serial No. 647,902.

Figure 5 is an edge view thereof;

Figure 6 is a section on the line 66 of Figure 4; and,

Figure 7 is a front elevation of a still further modification.

Reference will now be had to these views by i'neans of like characters which are employed to designate corresponding parts throughout.

The numeral 1 indicates the propeller shaft of a ship or the power shaft of any form of engine. The turning gear comprising the present invention is mounted on a suitable support consisting of a pair of spaced uprights 2 and 3 through which the shaft passes. Adjacent the inner faces of these uprights the shaft carries a pair of ratchet wheels 4 and 5 the teeth of which are cut in opposite directions as is apparent by a comparison of Figures 1 and 3. To the uprights 2 and 3 are pivoted hand levers 6 and 7 carrying pivoted latches 8 and 9 at the upper ends and pawls l0 and 11 at the lower ends. The latch 8 is connected to the pawl 10 and the latch 9 to the pawl 11 by means of rods 12 and 13 respectively The latches are so pivoted to the hand levers as to assume by gravity the position shown in Figure 8 wherein the pawls are free from the ratchets. hen it is desired to turn the shaft, as for example to take the engine out of dead center, one of the latches is pressed inwardly towards its lever according to the ratchet to be engaged. The lever is now pulled against the teeth of the ratchet whereby the shaft is turned.

in Figure iis shown a modified form for use in places where the engine cannot be turned over by hand power. The shaft carries a pair of oppositely cut ratchets 21 and 22 in the same manner as the form illustrated in Figures 1 2 and 3. Above the ratchets a power lever 23 is pivoted on a spindle 24 which extends substantially parallel with the shaft. Through the lower portion of the power lever is passed a stem 25 to one end of which is secured the vertex of a bell crank lever comprising an operating arm 26 and an actuating arm 2'2 The remaining end of the stem 25 carries an actuating arm 28 extending oppositely to the member 27.

In the lower edge of the power lever 23 are cut a pair of notches 29 and 30 in which spectively.

are pivoted pawls 31 and 82adapted for cooperation with the ratchets 21 and 22 relo the free ends of the pawls are pivoted rods 33 and 34 respectively which pass throngh'the arms 27 and 28 respectively. The upper ends of the ro-cis are fitted each with a head 35 against which power lever is to be actuated by an auxiliar engine. The-advantage of this device is that ittdoes away with the necessity of the slip eccentric on the auxiliary engine, whereas theslipeccentric 1r y be used ontheinain engine to good ad ntage by means ofthis L "This does away with the Stevenson link now used, and is one ofthe important i improvements which the device will make in,.the system now in use.

"Lit/he form shown inFigure 7, the mechanism 'fonsettingthe pawls is spaced at a distance from the power lever. In this construction .ahand lever 4.0 is intermediately pivotedias at 41 at a pointindependent of the power lever. The member is connected to-the operating arm 26' of the bell cranl-z lever by means of nk- 42. The connections between the endsiof the link and the-members 2,6 and 4-0 are in the nature of u-niversaljoints 4-3 to. allow for the swing ing of the link when it is moved by the power ,lever 23 and also for the pivotal movement between this linlcand the lever arms to which it is connected. After one of the pawls is set by means of the lever to, the;power lever. is moved in the manner already pointed out in connection with Figures,4,5 and'ti.

.Vilhile a specific embodiment of the invenclaims.

tion has been illustrated. and described, it is to be understood that various alterations in the details of construction may be made without departing from t-lie=spirit of the invention as indicated by the --app'ended 'Having thus fully described the invention, what we claim as new and desire to protect by Letters Patent is 1. A turning gear comprising in combinaion with a shaft a pair of oppositely cut 'atchets carried thereby, a power lever pivoted on an axis substantially parallel with the shaft, ,pawls pivoted to the lever and adapted for independent engagement with the ratchets,-.anactuating lever pivoted to the power lever, arms extending from said actuatinglever in opposite directions and engagin sai'd pawls.

2. fr turning gear comprising in combination with a shaft apair of oppositely cut ratchets carried thereby, a power'lever pivoted on an axis substantially parallel with theshaft, pawls pivoted tothe lever an adapted for independent engagement with the ratchets, means associated with the, power lever for actuating. said pawls,a pivoted hand lever spaced fromthe power lever .andnoperativ-ely connected to said means.

I 3. A turning gear comprising in combina- LiOH witha shaft apairofoppositely cut rate-hots carried thereby, apow'er'lever oivoted on i an axis substantially parallel with the shaft, pawls pivotedto the lever and. adapted for independent engagement with the ratchets, an: operating lever pivoted to the po\ve r,lever,. arins extending from said operating-lever in opposite directions and engaging said pawls, a hand lever pivoted in spaced relation from anddndependent of said power lever and linked-to said operating lever.

' In witness whereof we have hereunto set our hands.

THOMAS w. sonar. JOHN r. oonrnnr.

so i 

